Earth SystemsBy: Miishen´╗┐


´╗┐Scott Carrier, Tom Lopez, Sarah Vowell, Andrei Codrescu, Jay Allison, Barrett Golding, An Hour Of Earth, 2002, NASA EDUCATIONAL PROJECTS,

The Earth is a closed system. Earth is a closed system because it does not let any more matter then it already has into it. Its basically recycling all the matter. There IS an exception, which is meteorites. Meteorites are an exception because they are the only thing from space that comes into the Earth's atmosphere.
Source: Ms. Barb Light, Earth Systems Earth Notes UNIT ONE, unpublished notes, page 1.